Design of Differential Source Fed Circularly Polarized Rectenna With Embedded Slots for Harmonics Suppression

Abstract

This work presents an enhanced rectenna with a differential source feeding scheme for radio frequency (RF) energy harvesting at 2.45 GHz frequency. A circularly polarized (CP) microstrip antenna with embedded slots is designed which efficiently attains harmonics suppression. By modifying size and position of two diametrically opposite triangular projections in the top patch, two orthogonal modes that have equal magnitude and are in phase quadrature are excited. The four radial slots embedded in the antenna can block 2nd and 3rd harmonics which is suitable for onboard rectenna design without harmonics filter. A microstrip tapered feed line is used to match antenna element with 50-ohm impedance. The designed antenna is then tested for RF energy harvesting in two ways. One is conventional single source fed rectenna (SSFR), and the other is proposed differential source fed rectenna (DSFR). In the DSFR, the designed antennas are differentially operated by making a difference of λg/2 path length (λg Guided wavelength), and the ports are then connected to a differentially driven optimized rectifier circuit. For comparison, an SSFR and a DSFR are fabricated and tested. The circuit parameters in each case are optimized in Agilent Design System (ADS) 2011 software to maximize RF to direct current (DC) conversion efficiency. The proposed DSFR has a maximum efficiency (RF-DC) of 41.63% at 10 dBm RF input power. In the input power range from −20 dBm to 10 dBm, the DSFR has improved performance and higher efficiency over the SSFR.

Broadband circular polarized patch antenna with harmonic suppression

“…Comparison of the proposed CP antenna with reported state of art designs are listed in [ Table 3 ]. The proposed CP antenna offers large bandwidth as compared to all other antennas reported table in (1-5) (9) (11) (12) & (16) . The proposed antenna offers Circular Polarization (CP) compared to antenna reported table in (1)(2)(3)(4)(5) .…”

“…Also, upto 4 th higher order harmonic suppression achieved in proposed antenna. Table 3 continued 2017 (4) 3 2.4 80 Linear Spur-Line Filter 2018 (5) 2 2.4 80 Linear DGS 2018 (9) 3 2.4 500 Linear Slotted 2018 (11) 2 3.5 200 Circular λ /4 Stepped-Impedance resonators (SIRs) 2018 (12) 2 2.4 300 Circular Slot and stubs multilayer 2018 (16) 3 2.4 90 Circular Slot with differential feed Proposed work 4 2.4 1260 Circular λ /4 resonator with capacitive feed and partial gnd…”

“…A circularly polarized (CP) microstrip antenna with embedded slots is designed which efficiently attains harmonics suppression (15) . CP Antennas offers lots of applications in modern-day wireless communication (16,17) .…”

Reconfigurable Antennas for RF Energy Harvesting Application: Current Trends, Challenges, and Solutions from Design Perspective

“…Figure 5. Overview of the hybrid (combination of frequency, polarization, or pattern) reconfigurability antennas for RF energy harvesting applications (a) [127], (b) [128], (c) [129], and (d) [130].…”

A Method of Reducing Air-Gap Harmonic of Permanent Magnet Motor for Fitness Car

“…PMSM has excellent electromagnetic performance, but the application of PMSM is limited due to excessive internal harmonics. In this regard, how to suppress harmonics is the key to the design of permanent magnet synchronous motor [1][2][3][4]. Many literatures about surface mounted permanent magnet synchronous motor and interior permanent magnet synchronous motor have done extensive research [5][6][7][8][9], and the research potential of hybrid permanent magnet synchronous motor is great.…”